Well, it depends on how old you are. If it is your first year having your period it can be uneven and so that would be ok, but if you know that you are on a schedule for your period then yes, 36 days would be considered late.
It means your period is five days late. Only you know your chances of being pregnant.
Yes. From the first day of the last period you had - count forward 28 days (or when you expected to start). Day 29 would be 1 day late.
What if you are three days late for your period? It's normal for there to be around 7 days variation from your average menstrual cycle. A few days 'late' isn't a big deal, as long as you're not sexually active no reason for you to worry about it.
If your period arrived 3 days late then you are not pregnant. In very, very rare cases some women see some blood spotting throughout a pregnancy which they mistake for a period and do not know they are pregnant but if your period just arrived a few days later than normal then it would seem that you are not pregnant.
Yes, sometimes your period can just be late. You can check this site for more information as to why it could have been late. http://www.scarleteen.com/article/pink/m_i_a_or_dude_wheres_my_period
From personal experience, yes! I was 55 days late and had just recently passed a large stone. 5 days after passing the stone my period arrived.
pregnancy
There are a few reasons why a person may have a period that is 9 days late. The person may be pregnant or it could be stress related.
If you are sexually active then you could be pregnant but if not then you could just having a late or irregular period.
5days
If you have had unprotected sex, and now you are two days late , then you could very well be pregnant.